规则七、be+-ed+介词结构常可把be去掉保留-ed+介词做状语

例13Michael’s new house is like a huge palace, ______with his old one.

A. comparing B. compares C. to compare D. compared

解析：“和。。。相比较”结构为be compared with，现在做句子的状语，所以只保留非谓语动词，把动词be去掉，答案为D。

例14 _______ with a difficult situation, Arnold decided to ask his boss for advice.

A. To face B. Having faced C. Faced D. Facing

解析：“面对”结构为be faced with, 现在做句子的状语，所以只保留非谓语动词，把动词be去掉，答案为C。

规则八、非谓语动词作状语，其逻辑主语必须和句子主语保持一致，和句子主语构成主谓关系时用-ing形式，构成动宾关系是用-ed形式。其逻辑主语和句子主语不一致时，要在非谓语动词前加逻辑主语，构成独立主格结构

例15. ____ twice, the postman refused to deliver our letters unless we changed our dog.

A. Being bitten B. Bitten C. Having bitten D. To be bitten

解析：本题考查非谓语动词作状语，其逻辑主语应和句子主语the postman一致，the postman应该是被咬，所以答案为B。

例16._______ in the fields on a March afternoon, he could feel the warmth of spring.

A. To walk. B. Walking C. Walked D. Having walked

解析：本题考查非谓语动词作状语，其逻辑主语应和句子主语he一致, he 和walk应该是主动关系，所以答案为B。

例17. While watching television, __________.

A. the doorbell rang B. the doorbell rings

C. we heard the doorbell ring D. we heard the doorbell rings

解析：根据“非谓语动词作状语，其逻辑主语必须和句子主语保持一致”的规则，watching的逻辑主语应和后面句子主语一致，所以句子主语应为“we”，答案为C。

例18. The children went home from the grammar school, their lessons ____ for the day.

A. finishing B. finished C. had finished D. were finished

解析：本题没有连词，所以后面应用非谓语动词，the lessons是非谓语动词的逻辑主语，和非谓语动词构成独立主格结构。根据句意应是“被完成”，所以答案为B。